One thing that has helped me with sparring stamina is practicing staying in range and using pivoting and head movement instead of shuffling or retreating when not punching. Not by any means a 'shortcut', but a technique I've used to be elusive without expending all my energy skipping and shuffling.

Switch hit and throw the straight left straight away lands at a very high connect percentage as it takes my opponents by surprise as there not used to seeing a punch come from that direction and its very fast.

Switch hit and throw the straight left straight away lands at a very high connect percentage as it takes my opponents by surprise as there not used to seeing a punch come from that direction and its very fast.

Learning to push an opponent to the ropes and then keep him there while changing range.

i.e. shoulder him to the ropes while throwing body shots. Throw to the head when he hits the ropes, then drive your body into him and throw some body shots. Step back while jabbing and look for the right hand, then get right back on him. Use your lead leg to keep him pinned.

Throwing unorthodox punches. My favorite thing to do is step to my right, dig in with a left uppercut to the center of the body, and then come up with a hard hook to the nose. In addition, a chopping right to the side of the head is a great punch to throw. It's very disorienting to be hit from punches you can't see.

Throwing unorthodox punches. My favorite thing to do is step to my right, dig in with a left uppercut to the center of the body, and then come up with a hard hook to the nose. In addition, a chopping right to the side of the head is a great punch to throw. It's very disorienting to be hit from punches you can't see.

Recently, while sparring, I was in with a quicker guy. He was flurrying on me until I hit him with that chopping overhand right. It spun his head gear around and wobbled him.